Boiler wall



April 7, 1931. r. E. MURRAY ET AL BOTLER WALL Filed Dec.

(inventor/b mamas EM/rra fo/m ffLou/rence. 93x 4 Patented 'Apr. 7, 1931 I UNITED STATES PATENT OFFICE moiuns'n MURRAY, or BROOKLYN; AND Joan 11. LAWRENQE, or new YonxJw'. 2.; sun) LAWRENCE nssrenoa r SAID MURRAY; JOSEPH BRADLEY MURRAY;

T OMAS E MURRAY, an, AND JOHN F.

MURRAY, EXECUTORS OF SAID THOMAS E.

MURRAY, DECEASED, ASSIGNORS TO METROPOIJITAN ENGINEERING COMPANY, A

CORPORATION OF NEW YORK Application filed December In a previous a plication of Thomas E. Murray, No. 61,38 filed October 9, 1925, there is illustrated a boiler with a set of upper tubes of a common type and with a set of water tubes lining the combustion chamber of the furnace and serving to utilize the radiant heat of the burning fuel to greatly increase the veiiiciency of, the boiler. And 1n various ings illustrate embodiments of the invention.

Fig. 1 is a longitudinal section (with the tubing in elevation) cut away at the top, illus trating .a boiler like that of application No.

. 61,387 referred to above.

ward at their forward ends.

Fig. 2 is a cross section on the line 2-2 of Fig. 1;

Fig. 3 is an enlargement'of a joint between two headers of Fig. 1;

Fig. 4 is a similar view of amodification. Fig. 5 is a horizontal section 'of a'wall.

Fig.6 is an elevation of an upper end ofa sup ort.

Re erring to the drawing, there are carried above the combustion chamber approximate- 1y horizontal tubes of the ordinary style in two banks, 1 and 2, slightly inclined down- Headers 3 and 4 at their higher ends are" connected to each other by pipes 5 and lead the steam upward to any usual or suitable steam drum over head; whence the water passes downward by vertical headers 6 and '7'aud pipes 8 to the lower ends of the horizontal tubes. The vertical headers 7 communicate at their lower ends with a cross header or mud drum 9.

p In addition to the tubular system'described above the furnace, the several walls of the furnace comprise vertical tubes 10 at the op-' posite sides, tubes 11 along the rear end wall, tubes' l2 along the front end wall andtubes 13 along the bottom'wall the latterbeing horizontal or slightly inclined to facilitate BOILER "WALL 1, 1925. Serial No..72,456.

circulation. The front walLhasits lower portion offset and connected by an arch or roof with the upper portion, t e arch comprising or being lined with horizontal tubes 14 extending upward at their inner ends and communicating with an upper cross header 16. Headers 17 and 18 are provided for the provements are applicable to tubes of various styles and arrangements other than those shown. In the-case illustrated the tubes have "outside flanges 11 (Fig. 5) imbedded in a layer or coating of refractory material 21 on the outside of which is a plate 22. The upper system of tubes may be enclosed and supported in any usual or suitableway'. The

lower walls are supported from above as, for.

example, by means of hangers 23 bolted to the upper portions of said walls and suspended from overhead beams 23, Fig. .6. 7 According to the resent invention, expan-' sion joints are provided at various points to .p'ermit expansion, particularl of the lower parts of the structure, under t e intense heat to which the tubular walls are subjected, and to prevent the passage of air between the different parts. 1

As shown in Figs. 1 and 2 plates 24, 25 and 26 are provided, preferably welded to the undersides of the headers and extending down to the floor 27 through one or more bends adapted to be easily flexed as the walls expand and contract.

The plate is shown bent outward at 28 then vertically at 29 to v the bottom of the wall, thence inward at;30 and finally downward at 31 to connect with an angle 32 bolted to the floor. A similar joint is provided between the adj acent headers 9 and 16 comprisin plates welded to the. respective headers an provided with outwardly extending portions 33 and 34; which are riveted to each other at their outer edges Similarly the joints at the bottom (Fi s. 1 and'2) may be made of a plurality of p ates instead of a single plate.

Various other styles of expansion joint may be used at all or any of the desired points. Fig. 4 illustrates an alternative type of joint I in which the headers 9 and 16 areprovided with welded fins 35 and 36 overlapping and arranged to slide on each other to accommodate the relative movement of the two headers. v

The complete wall structure, comprising the water tubes and the refractory material, expands upward or downward. That is to say, the tubes and the refractory material in v any wall expand together. And the joints illustrated take up this expansion for the complete wall section;

Various modifications may be made by those skilled in the art without departing fromthe invention as defined in the followset oftubes with a header on their upper ends v ing claims.

What we claim is;

1. A boiler having an upper set of tubes with a header on their lower ends and a lower adjacent to the header of the upper tubes, said headers being parallel to each other, and an expansible member connected to said headers and extending across the space between them and adapted to permit relative movement of said headers toward and away from each other. i

. 2. An expansion joint for a boiler having two headers adjacent to and spaced apart from each other, said joint comprising plates parallel with said headers, connected to each other along one edge and spaced apart and connected attheir other edges to the respective headers.

In witness whereof, we have hereunto signed our names.v

THOMAS E. MURRAY. JOHN H. LAWRENCE. 

